Poker Term
按钮位河牌过牌-加注（彩虹面）（BTN River Check-Raise Rainbow）
Refers to a situation on the river where the player in the button position checks first, then raises after an opponent bets, and the board is a rainbow all three cards of different suits.
Background
In Texas Hold'em, the button position (BTN) is the most advantageous post-flop position. A rainbow board refers to a flop or river where all three cards are of different suits, eliminating flush draws and making hand strength more dependent on board structure.
Scenario Analysis
BTN River Check-Raise Rainbow typically occurs in the following situations:
- After actions on the flop and turn, the river is dealt, and the BTN holds a strong hand (e.g., set, straight) or a bluff, intending to check-raise to maximize value or force a fold.
- A rainbow board removes the possibility of flush draws, so the opponent's hand range is relatively clear, and the raise size is usually large (e.g., 2-3 times the pot).
Strategic Considerations
- Value Raise: When the BTN holds the nuts or near-nuts, checking to induce a bet from the opponent, then raising big, aiming for a shove or extracting high value.
- Bluff Raise: On a rainbow board, the BTN may leverage positional advantage to bluff with hands lacking showdown value (e.g., missed gutshot), forcing opponents to fold marginal hands.
- Frequency Balancing: Regular players should use this line cautiously, as a river check-raise is a strong play; overusing it can lead to being caught in bluffs.
Notes
- On a rainbow board, opponents are more likely to hold top pair or overpairs but rarely flushes, so the timing of the raise should be precise.
- Consider board texture: If the rainbow board is connected (e.g., 6-7-8 rainbow), straights are more likely, and raises should target the opponent's range accordingly.